For engine pressure ratio, which statement is true?

For engine pressure ratio, which statement is true?

• A. Only 2 is true
• B. Only 1 is true
• C. Both 1 and 2 are true
• D. Neither 1 nor 2 is true

Answer: (B)

Engine pressure ratio is a measure that compares the pressure at the engine’s exhaust (after the turbine/nozzle) to the pressure at the compressor inlet. It climbs as throttle or engine speed increases, so higher EPR generally means more engine power or thrust. It’s a useful quick indicator, but it’s not a direct measure of fuel flow and it can be affected by factors like inlet pressure recovery, altitude, and Mach number. I don’t have the exact statements 1 and 2 to evaluate why only one is true. Please share the two statements, and I’ll explain why the correct choice reflects only statement 1 being true.

Engine pressure ratio is a measure that compares the pressure at the engine’s exhaust (after the turbine/nozzle) to the pressure at the compressor inlet. It climbs as throttle or engine speed increases, so higher EPR generally means more engine power or thrust. It’s a useful quick indicator, but it’s not a direct measure of fuel flow and it can be affected by factors like inlet pressure recovery, altitude, and Mach number.

I don’t have the exact statements 1 and 2 to evaluate why only one is true. Please share the two statements, and I’ll explain why the correct choice reflects only statement 1 being true.